Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238125
01/20/17 09:46 PM
01/20/17 09:46 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Alex if you want some pics, i'll probably just go ahead and text you some pics lol! Im gonna start with the engine grounds, in this pic you can see I have a cable from each head going to a common bellhousing bolt which then has a 1awg cable hanging off that then goes to a through firewall isolated junction stud. Also you can see another cable hanging by the starter, it is the charge wire for the alternator that went through a grommet in the firewall and connected to a 160A marine grade resetable circuit breaker. Those cables were all hand made out of 4 awg shielded cable I got from an implement pivot/generator ag business.
Last edited by 72Swinger; 01/20/17 09:53 PM.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: mcat4321]
#2238143
01/20/17 10:16 PM
01/20/17 10:16 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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ok.. your engine block needs to be grounded directly to your battery, both heads should be grounded to each other and then connected to the ground on the block.. ALL modern electronics should be grounded to a wire that is touching the battery. direct grounded Your right, but I was'nt finished. The pic below shows the through firewall junction on the dash side. From there another 1 AWG cable goes up to my buss bar that is isolated from body. You can also see the alternator charge wire connection at the breaker to.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238145
01/20/17 10:22 PM
01/20/17 10:22 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Here is the best pic of the buss bar itself, you cant see it but there is another identical 1 awg cable connection in the lower right corner of the buss bar and THAT cable goes directly to the battery in the trunk. As far as the Gold box is concerned, you run both + and - wires for it directly to the battery posts.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238194
01/21/17 12:05 AM
01/21/17 12:05 AM
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Joined: Jan 2003
Posts: 8,005 Tulsa OK
Bad340fish
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Not a Gen 3 car but I have an MS3X on my car.
I originally wired it like the manual says, with the grounds going to the back of the cylinder heads. It worked fine or so I thought, I had issues with Datalogs not working properly and reseting all the time. I also had an occasional backfire on startup as well.
After speaking with a well known MS guy he told me the manual is wrong and to remove the grounds to the engine. I did that and ran them off of a dedicated 12 gauge wire that goes to the battery. The only thing on that ground is the MS3 and my Wideband unit(LC2). This took care of the data log problem and the backfire issue.
68 Barracuda Formula S 340 87 "Chrysler" Conquest
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238262
01/21/17 02:44 AM
01/21/17 02:44 AM
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72Swinger
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Highly suggest running MS3 + and - 12 awg wires direct to battery posts. Doing this decreases the current load on ALL the component inside that box, ie eliminates heat as much as possible. Im not gonna say my setup is the end all be all, its the first time ive went full retard on a ground strategy like this on one of my builds. One thing I might add to mine is another cable from the starter housing to the firewall stud. Having my battery in the trunk since this car was first ever fired in like 1997, when i did the Gen III swap I changed out all the old cables with 1 AWG hi strand solid copper GOOD cables, ran the 4 awg charge wire from the alt. and it terminates under the dash at my pos 12V junction bar and my pos cable goes from there to battery. Another pos cable goes from there to another through firewall isolated junction stud on the starter side of the firewall. Another 1 awg cable goes from there to starter stud. I have always had a pretty big discrepency between voltage reading at alternator output and at the battery post in the trunk. At one time it was so bad it 14v at the alternator and 13.1 at the battery post, and back then I even had a 8 awg wire that ran direct from alt to battery post. My current setup shows 14.5v at alt and 14.1v at battery post at idle. I did something right here.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238311
01/21/17 10:23 AM
01/21/17 10:23 AM
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Joined: Jan 2003
Posts: 8,005 Tulsa OK
Bad340fish
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I an important thing to remember is that devices feeding info to your ms need to share the same power and ground as the ms unit. A wide band controller is an example of that.
68 Barracuda Formula S 340 87 "Chrysler" Conquest
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238612
01/21/17 08:28 PM
01/21/17 08:28 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Anything grounded to the body will then have the body as a giant amplifier of NOISE to contend with as a result. Only thing NOT grounded to my buss bar on my car are my marker lights and tail lights. Only reason a cars body was/is ever used as a grounding point was simply out of convenience, not because of better function. And in the good ole days pre EFI and DIS and ECU's, RF noise from body grounds would on their worst day maybe make a radio station static'y.
Last edited by 72Swinger; 01/21/17 08:33 PM.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: AlexP]
#2238688
01/21/17 10:29 PM
01/21/17 10:29 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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I think OE wiring/ECU/sensors etc. have WAY more shielding/isolation built into the components themselves than the aftermarket stuff. I went the route I did because I trust Montes experience with the exact same style of cars/components that I am using. That and a 45 yr old body that still is probably 95% original as the day it was stamped together except for the 45 yrs of rust that I know damn good and well is there in those places you cant see. Another thing that made my decision was this simple thought, how many times have you heard or even wondered yourself when you or someone else has an electrical issue or phantom gremlin with their car and said " I bet its a bad ground" or "something isnt grounding right"? Im happy to say I can look at every single ground connection on my entire car in about 53 seconds.
Mopar to the bone!!!
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Re: Grounding my car. Lets start over.
[Re: 72Swinger]
#2238790
01/22/17 01:00 AM
01/22/17 01:00 AM
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Posts: 2,776 Ontario Canada
MattW
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Found his thread. Very good read! Unlawful section "Car wiring"
Last edited by MattW; 01/22/17 01:36 AM.
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